US20160236509A1 - Sealing assembly for rolling bearings, in particular for a hub bearing unit of vehicles and associated hub bearing unit - Google Patents
Sealing assembly for rolling bearings, in particular for a hub bearing unit of vehicles and associated hub bearing unit Download PDFInfo
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- US20160236509A1 US20160236509A1 US15/045,611 US201615045611A US2016236509A1 US 20160236509 A1 US20160236509 A1 US 20160236509A1 US 201615045611 A US201615045611 A US 201615045611A US 2016236509 A1 US2016236509 A1 US 2016236509A1
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- annular
- rigid shield
- shield
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- rigid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
- F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical roller bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/0073—Hubs characterised by sealing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/0005—Hubs with ball bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
- F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
- F16C33/7826—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of the opposing surface cooperating with the seal, e.g. a shoulder surface of a bearing ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
- F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7889—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to an inner race and extending toward the outer race
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7896—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members with two or more discrete sealings arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
- F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/002—Sealings comprising at least two sealings in succession
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
- F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
- F16J15/3264—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals the elements being separable from each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/50—Improvement of
- B60B2900/511—Sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
- F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
- F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
- F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/60—Thickness, e.g. thickness of coatings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
Definitions
- the present invention relates to a sealing assembly for rolling bearings, in particular for use in a hub bearing unit of vehicles, particularly, but not exclusively, useful both on the “outboard” side, i.e. facing, in use, the vehicle external body side of the unit itself, and “inboard”, i.e. facing the inside of the vehicle, having high sealing efficiency against external contaminants and low friction, as well as to a hub bearing unit provided with the same.
- the hub bearing units of vehicles comprise an outer ring, for example stationary in use, and an inner ring, for example rotating in use, provided on the outboard side of the hub bearing unit with a mounting flange for a vehicle wheel. Between the inner and outer rings respective seal assemblies are interposed, one on the outboard side and one on the opposite side, referred to as “inboard”.
- seal assemblies not only on hub bearing units but more generally on rolling bearings, there are the so-called “cassette” seals that comprise two rigid shields L-shaped in radial section, one of which is provided with an elastomeric gasket provided with a plurality of sliding lips.
- the known seal assemblies are relatively satisfactory, but often have large overall dimensions and relatively high friction. To achieve low friction the number of sliding lips can be reduced, relying in whole or in part to non-contacting labyrinth type seals. This, however, may decrease the efficiency of the seal, allowing a small part of the contaminants to come in contact with the one sliding lip, resulting in a premature wear of the same.
- both due to machining tolerances and the so-called “cornering” stresses in use sliding seals, especially axial ones may possibly perform incorrectly.
- the object of the present invention is to provide a sealing assembly for rolling bearings, particularly but not exclusively suitable to be used in a hub bearing unit of a vehicle wheel, having excellent hydraulic sealing characteristics against external contaminants, low overall dimensions and low friction.
- FIG. 1 illustrates schematically a view in radial section of a portion of a vehicle hub bearing unit (partial-view or partial-section), provided with a sealing assembly implemented according to the invention
- FIG. 2 illustrates schematically and in enlarged scale a detail of FIG. 1 , which shows the conformation of a first embodiment of the seal assembly according to the invention.
- FIG. 3 illustrates schematically a view in radial section of a portion of a vehicle hub bearing unit (partial-view or partial-section), provided with a sealing assembly implemented according to a second embodiment of the invention
- FIG. 4 illustrates schematically and in enlarged scale a detail of FIG. 3 , which shows the conformation of the second embodiment of the seal assembly according to the invention.
- FIG. 5 illustrates schematically and in enlarged scale, a third embodiment of the seal assembly according to the invention, replaceable in FIGS. 1 and 3 to the embodiments of FIGS. 2 and 4 .
- reference number 1 denotes as a whole a rolling bearing, in the example illustrated constituting a hub bearing unit and comprising an outer ring 2 , an inner ring 3 , a plurality of rolling bodies 4 (only one of which for sake of clarity is shown in dashed-lines) interposed between the outer ring 2 and the inner ring 3 to make them rotatable, one with respect to the other, about a common rotation axis A, and a seal assembly 5 , arranged fitted in-between the rings 2 and 3 , illustrated truncated for simplicity, to close an annular space 7 radially bounded between the rings 2 and 3 and which accommodates the rolling bodies 4 .
- the rings 2 and 3 may be part of a rolling bearing of any known type, whether it is part or not of the hub bearing unit 1 .
- the outer ring 2 is stationary in use, while the inner ring 3 is rotating in use around a relative common rotation axis A of the rings 2 and 3 , which in general is also a common symmetry axis of the seal assembly 5 and of one or both rings 2 and 3 .
- the stationary outer ring 2 is fixed to an upright of the vehicle suspension, known and not illustrated for simplicity, while the inner rotating ring 3 is made integral with a vehicle wheel, known and not illustrated for simplicity.
- the seal assembly 5 comprises ( FIG. 2 ) a first rigid annular shield 10 , made of metallic or plastic or polymeric material, designed to be integrally carried, in use, by a first bearing ring, in this case by the inner ring 3 rotating in use, and a second rigid annular shield 11 , also made of metal or plastic or polymeric material, designed to be integrally carried in use by a second bearing ring, in this case by the outer ring 2 , stationary in use.
- the second annular shield 11 is shaped in radial section like an upside down L facing the outside of bearing 1 , i.e. facing on the side opposite to the annular space 7 , and comprises a radially outer sleeve-shaped journalling portion 12 and a flange portion 13 which extends radially cantilevered inwards from a first end 14 ( FIG. 2 ) of the journalling portion 12 facing the side opposite to the first annular shield 10 and towards the inside of bearing 1 .
- the annular shield 11 furthermore integrally and radially carries on the inside an annular sealing element 15 made of elastomeric material, which has been made integral in an indivisible manner (unless broken) to the shield 11 during vulcanization by means of a known process.
- the first annular shield 10 is shaped in radial section like a C, whose concavity faces the annular shield 11 and faces towards the annular space 7 and, so, towards the inside of bearing 1 ;
- the first shield 10 comprises a first radially inner sleeve portion 16 defining a journalling portion of the shield 10 , a flange portion 17 which extends radially cantilevered outwards from a first end 18 of the sleeve portion 16 , end 18 facing the side opposite to the first annular shield 11 , and a second radially outer sleeve portion 19 extending axially, cantilevered from the flange portion 17 on the same side of the first sleeve portion 16 , to which the sleeve portion 19 is radially facing and to which it is coaxial in relation to a common symmetry axis A of the shields 10 , 11 , coincident with the relative
- the annular sealing element 15 comprises a first annular lip 20 which extends axially cantilevered from the flange portion 13 of the shield 11 and towards the shield 10 , rotating in use, also known by the term “flinger”, so as to be radially interposed between the first radially inner sleeve portion 16 and the second radially outer sleeve portion 19 of the shield 10 , radially closer to the radially outer sleeve portion 19 than to the radially inner sleeve portion 16 .
- the sealing element 15 also comprises a second annular lip 21 , elastically deformable, which is arranged radially on the inside of the first annular lip 20 and which extends axially and radially (therefore is oriented inclined with respect to the axis A) to cooperate in contact and_with a certain interference, albeit reduced, with the first rigid shield 10 and, in particular, according to the non limiting embodiment shown, with the sleeve portion 16 , with which it defines a sliding seal which, in the embodiment shown, is a radial sliding seal.
- the annular lip 20 is shaped so as to radially delimit on the outside a first annular channel 22 facing a free end edge 23 of the radially outer sleeve portion 19 of the C-shaped shield 10 ; the free edge 23 is opposite to the flange portion 17 of the first shield 10 .
- the first shield 10 carries integrally with the flange portion 17 thereof and on the side facing the second shield 11 a second annular sealing element 24 made of elastomeric material and including a third annular lip 25 , which extends axially cantilevered from the shield 10 and towards the shield 11 and which is radially interposed between the lip 20 and the lip 21 .
- the annular lip 25 is shaped so as to radially delimit, on the outside, a second annular channel 26 ( FIG. 2 ) facing a free end 27 of the annular lip 20 .
- the shield 10 defines in radial section, together with the annular sealing element 24 , an E-shaped element whose prongs or arms, defined by the two sleeve shaped portions 16 and 19 and by the annular lip 25 are arranged radially alternated with the lips 20 and 21 , forming therewith a labyrinth radial path.
- the annular sealing element 15 also comprises, according to a further and important aspect of the invention, a further annular lip 28 which extends radially and axially cantilevered from the journalling portion 12 of the shield 11 and towards the flange portion 17 of the shield 10 , such as to be interposed between the journalling portion 12 and the radially outer sleeve shaped portion 19 of the shield 10 , next on the outside to the same in the radial direction and obliquely to the flange portion 17 of the first rigid shield 10 .
- the annular lip 28 is elastically deformable and is designed to assume selectively a first and a second configurations, different to one another; in the first configuration, non-deformed and shown in FIG. 2 , the annular lip 28 is in its normal operational condition, in which lip 28 is not subjected to outer stresses and is not, therefore, elastically deformed; in such first configuration, in normal operational use, lip 28 does not contact a radially outer lateral surface 29 ( FIG.
- the annular lip 28 extends cantilevered from an axially intermediate position of the journaling portion 12 of the second rigid shield 11 , such that, radially on the outside of the annular lip 28 , a first annular recess 32 is delimited between lip 28 and the journaling portion 12 , which first recess radially enlarges in axial direction towards the flange portion 17 of the first rigid shield 10 .
- lip 28 extends cantilevered from an axially intermediate position of a first portion 31 of the elastomeric sealing element 15 which radially covers on the inside at least part of the journalling portion 12 of the shield 11 so that, radially on the outside of the annular lip 28 , the first recess 32 is delimited between lip 28 and the portion 31 of the annular sealing element 15 .
- the labyrinth seal 33 extends axially by at least a stretch of the axial extension of the sleeve portion 19 .
- the sleeve portion 19 comprises ( FIG. 2 ), starting from the flange portion 17 , a first annular stretch 34 , a second annular stretch 35 and a third annular stretch 36 .
- the first annular stretch 34 is straight and is arranged parallel to the annular lip 25
- the second annular stretch 35 is slanted so as to be distanced from the symmetry axis A on the side opposite to the first stretch 34
- the third annular stretch 36 is, proceeding in the axial direction, firstly radially bulged on the outside, then becomes thin in a radial direction towards the free end edge 23 of the sleeve shaped portion 19 .
- the labyrinth seal 33 extends axially by at least part of the axial extension of the third stretch 36 .
- the first and the second annular channel 22 and 26 are designed to intercept and collect any external contaminants which may overcome the first labyrinth seal 30 and also the eventual supplementary labyrinth seal 33 ; furthermore, between the annular channel 22 formed by lip 20 and the sleeve portion 19 a first annular chamber 37 for collecting said contaminants is delimited ( FIG. 2 ), arranged downstream of the labyrinth seal 33 , and a second annular chamber 38 for collecting the contaminants is delimited between the lip 20 and the lip 25 . Therefore, the labyrinth seal 33 is arranged upstream of chambers 37 and 38 having regard the incoming direction of the contaminants
- the lip 28 is, according to an aspect of the invention, adapted to radially bend outwards (also thanks to the presence of the annular recess 32 ) to allow an easy and quick outflow of the contaminants by gravity from the collecting chambers 37 , 38 .
- the annular shield 10 is arranged axially on the inside of the annular shield 11 , so that a second end 39 of the journalling portion 12 , opposite to the end 14 and in this case completely covered by the portion 31 of the elastomeric sealing element 15 , axially delimits a second annular recess 40 on the outside of the shield 10 , in front of it and on the opposite side to the flange portion 13 .
- the lip 20 and the lip 25 each have a respective free end, the end 27 already described for the lip 20 and an end 41 for the lip 25 , which are radially bent outwards and towards the sleeve portion 19 ; a first radial annular space 42 and a second radial annular space 43 are delimited, between the end 27 and the sleeve portion 19 and between the end 41 and the lip 20 having substantially similar dimensions, respectively.
- the first annular sealing element 15 also comprises a fifth annular lip 44 which extends inwardly and radially cantilevered from a radially inner edge 45 of the flange portion 13 and which cooperates with the sleeve shaped portion 16 of the shield 10 to define a third labyrinth seal 46 therewith.
- the contacting sealing lip 21 is placed highly sheltered from external contaminants; in case of particularly abundant flows of contaminants, the lip 28 bends inward and closes, preventing the inflow of contaminants, then successively opens and allows the removal by gravity of said contaminants that might have previously entered and were collected in the channels 22 and 26 and in the chambers 37 and 38 .
- sealing lip 21 and also the entire sealing assembly 5 are immune from any axial displacements between the shields 10 , 11 with respect to the designed expected position, both as a result of machining tolerances and of deformations in use, for example during the “cornering”.
- FIGS. 3 and 4 show a sealing assembly 105 made according to the invention. Details similar to or identical to those as already described are indicated, for sake of simplicity, with the same reference numbers.
- Sealing assembly 105 is substantially identical to sealing assembly 5 already described except for not possessing the sealing element 24 with lip 25 , and the lips 21 and 44 .
- the sealing element 15 comprises, instead, in combination with what has been described, an elastically deformable annular lip 131 , which replaces lip 21 .
- Lip 131 is arranged radially inside the annular lip 20 and extends axially past the lip 20 to cooperate in contact with the flange portion 17 of the rotary shield 10 , with which it defines, according to this embodiment of the invention, an axial sliding seal.
- the annular lip 131 is shaped in radial section like an open V and comprises a root portion 132 immediately adjacent to the flange portion 13 of the shield 11 and an end portion 133 arranged slanted with respect to the axis A so as to move away from the sleeve shaped portion 16 of the shield 10 as it approaches the flange portion 17 of the shield 10 itself.
- the lip 131 has at its end portion 133 a free end 134 which cooperates in contact with the flange portion 17 ; similarly the lip 20 has the free end 27 , which is radially bent outwards and towards the sleeve portion 19 so as to be slanted with respect to axis A, with an inclination substantially similar to that of the portion 133 of the lip 131 .
- the free ends 134 and 27 delimit therebetween a first radial annular space 136 having dimensions substantially similar to the one of the radial annular space 42 delimited between the free end 27 and the sleeve shaped portion 19 of the shield 10 , thus allowing to optimize the spaces and facilitate in use the emptying of the collecting chamber 37 .
- the described shape of the portion 19 is a further barrier against the entry of contaminants into the chamber 37 and into the collecting channel 222 and, by defining towards the chamber 37 a sort of “flared” conduit i.e. enlarging towards the chamber 37 , it favors emptying by gravity.
- the annular sealing element 15 preferably also comprises ( FIG. 4 ) a further annular lip 138 , which extends radially inwards from the lip 131 , from a point comprised between the root portion 132 and the end portion 133 of the annular lip 131 , and which cooperates radially outwards with the flange portion 16 of the shield 10 to define therewith a second labyrinth seal 139 .
- the lip 28 becomes sliding, thus although increasing friction only temporarily and slightly (thanks to reduced interferences that are created), but drastically increasing the sealing and protection action of the lip 131 .
- the sliding seal performed by the lip 131 is an axial seal and to the fact that the free end 134 of the lip 131 is located radially on the outside of a second annular collecting chamber 144 for the external contaminants which is bounded between the lips 131 and 20 and wherein the channel 22 pours from the free end 27 , which serves as a weir or drain, a possible excess of contaminants that are in the chamber 37 without the latter affecting the free sealing end 134 of the lip 131 .
- reference number 205 indicates a further and preferred embodiment of the sealing assembly according to the invention. Details similar to or identical to those as already described are indicated, for sake of simplicity, with the same reference numbers.
- Sealing assembly 205 is similar to sealing assembly 5 , from which it differs only for the shape of the sleeve portion 19 , which is simplified and is simply cylindrical, and for the shape of the first elastically deformable annular lip, indicated with 220 , which possesses an arc of a circle shape and defines the first annular channel 22 with its own concavity, which faces towards the second sleeve portion 19 of the first rigid shield 10 ; the first annular lip 220 has a curvature such as to delimit, with the second sleeve portion 19 and with the first elastically deformable annular lip 28 , a collecting chamber 237 for possible contaminants which pass beyond the first labyrinth seal 30 .
- the collecting chamber 237 is shaped like a C facing towards the first rigid shield 10 and has a depth taken in radial direction substantially equal to or greater than its own width taken in axial direction.
- the first elastically deformable annular lip 220 extends axially on the same side of annular lip 28 and axially beyond the latter to form with the flange portion 17 of the first rigid shield 10 either a sliding seal or a labyrinth seal.
- the second annular lip 21 is replaced by an elastically deformable lip 221 , which cooperates in sliding manner with the first sleeve portion 16 of the first rigid shield 10 by means of a free end 234 thereof, which end has in radial section a thickness D greater than the thickness d of a root portion 235 of the annular lip 221 facing towards the flange portion 13 of the second rigid shield 11 .
- This shape of lip 221 allows a greater flexibility of the same to be obtained and at the same time allows a wider contact surface to be obtained between lip 221 and lateral surface of the sleeve portion 16 , improving the sealing action.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing Of Bearings (AREA)
- Rolling Contact Bearings (AREA)
Abstract
A sealing assembly insertable between a stationary outer ring and a rotating inner ring of a bearing or hub bearing unit, having a first C-shaped shield supported by the inner ring and a second L-shaped shield supported by the outer ring. The first shield has a first annular sealing element having a first annular lip that extends axially cantilevered from the flange portion of the second shield in a position facing a radially outer sleeve shaped portion of the first shield and a second annular lip, elastically deformable, arranged radially on the inside of the first lip and which cooperates in contact with a radially inner sleeve shaped portion of the first shield, which carries a second sealing element having a third annular lip, which extends axially cantilevered from the first shield and towards the second shield and which is radially interposed between the first and the second lip.
Description
- The present invention relates to a sealing assembly for rolling bearings, in particular for use in a hub bearing unit of vehicles, particularly, but not exclusively, useful both on the “outboard” side, i.e. facing, in use, the vehicle external body side of the unit itself, and “inboard”, i.e. facing the inside of the vehicle, having high sealing efficiency against external contaminants and low friction, as well as to a hub bearing unit provided with the same.
- As known, the hub bearing units of vehicles comprise an outer ring, for example stationary in use, and an inner ring, for example rotating in use, provided on the outboard side of the hub bearing unit with a mounting flange for a vehicle wheel. Between the inner and outer rings respective seal assemblies are interposed, one on the outboard side and one on the opposite side, referred to as “inboard”.
- Among the most used seal assemblies, not only on hub bearing units but more generally on rolling bearings, there are the so-called “cassette” seals that comprise two rigid shields L-shaped in radial section, one of which is provided with an elastomeric gasket provided with a plurality of sliding lips. The known seal assemblies are relatively satisfactory, but often have large overall dimensions and relatively high friction. To achieve low friction the number of sliding lips can be reduced, relying in whole or in part to non-contacting labyrinth type seals. This, however, may decrease the efficiency of the seal, allowing a small part of the contaminants to come in contact with the one sliding lip, resulting in a premature wear of the same. In addition, both due to machining tolerances and the so-called “cornering” stresses in use, sliding seals, especially axial ones may possibly perform incorrectly.
- The described drawbacks are not eliminated by the solution according to EP1795787A1 based on the use of a labyrinth seal between the two shields, formed by substantially rigid and opposite elastomeric projections. Actually, the contaminants that penetrate beyond the labyrinth seal are then discharged only with difficulty from a collecting chamber internal to the seal and thus increase the wear of the contacting lip. Furthermore the “cornering” problem is not solved.
- The object of the present invention is to provide a sealing assembly for rolling bearings, particularly but not exclusively suitable to be used in a hub bearing unit of a vehicle wheel, having excellent hydraulic sealing characteristics against external contaminants, low overall dimensions and low friction.
- According to the invention a sealing assembly for rolling bearings and a hub bearing unit provided with said sealing assembly having the characteristics set forth in the appended claims are thus provided.
- The invention will now be described with reference to the accompanying drawings, which show non-limiting embodiments thereof, wherein:
-
FIG. 1 illustrates schematically a view in radial section of a portion of a vehicle hub bearing unit (partial-view or partial-section), provided with a sealing assembly implemented according to the invention; -
FIG. 2 illustrates schematically and in enlarged scale a detail ofFIG. 1 , which shows the conformation of a first embodiment of the seal assembly according to the invention. -
FIG. 3 illustrates schematically a view in radial section of a portion of a vehicle hub bearing unit (partial-view or partial-section), provided with a sealing assembly implemented according to a second embodiment of the invention; -
FIG. 4 illustrates schematically and in enlarged scale a detail ofFIG. 3 , which shows the conformation of the second embodiment of the seal assembly according to the invention; and -
FIG. 5 illustrates schematically and in enlarged scale, a third embodiment of the seal assembly according to the invention, replaceable inFIGS. 1 and 3 to the embodiments ofFIGS. 2 and 4 . - With reference to
FIG. 1 , reference number 1 denotes as a whole a rolling bearing, in the example illustrated constituting a hub bearing unit and comprising anouter ring 2, aninner ring 3, a plurality of rolling bodies 4 (only one of which for sake of clarity is shown in dashed-lines) interposed between theouter ring 2 and theinner ring 3 to make them rotatable, one with respect to the other, about a common rotation axis A, and aseal assembly 5, arranged fitted in-between therings annular space 7 radially bounded between therings rolling bodies 4. - Generally, the
rings outer ring 2 is stationary in use, while theinner ring 3 is rotating in use around a relative common rotation axis A of therings seal assembly 5 and of one or bothrings rings outer ring 2, for example, is fixed to an upright of the vehicle suspension, known and not illustrated for simplicity, while the inner rotatingring 3 is made integral with a vehicle wheel, known and not illustrated for simplicity. - The
seal assembly 5 comprises (FIG. 2 ) a first rigidannular shield 10, made of metallic or plastic or polymeric material, designed to be integrally carried, in use, by a first bearing ring, in this case by theinner ring 3 rotating in use, and a second rigidannular shield 11, also made of metal or plastic or polymeric material, designed to be integrally carried in use by a second bearing ring, in this case by theouter ring 2, stationary in use. - The second
annular shield 11 is shaped in radial section like an upside down L facing the outside of bearing 1, i.e. facing on the side opposite to theannular space 7, and comprises a radially outer sleeve-shapedjournalling portion 12 and aflange portion 13 which extends radially cantilevered inwards from a first end 14 (FIG. 2 ) of thejournalling portion 12 facing the side opposite to the firstannular shield 10 and towards the inside of bearing 1. - The
annular shield 11 furthermore integrally and radially carries on the inside anannular sealing element 15 made of elastomeric material, which has been made integral in an indivisible manner (unless broken) to theshield 11 during vulcanization by means of a known process. - According to a first aspect of the invention, in combination with the described structure of the
shield 11, the firstannular shield 10 is shaped in radial section like a C, whose concavity faces theannular shield 11 and faces towards theannular space 7 and, so, towards the inside of bearing 1; thefirst shield 10 comprises a first radiallyinner sleeve portion 16 defining a journalling portion of theshield 10, aflange portion 17 which extends radially cantilevered outwards from afirst end 18 of thesleeve portion 16,end 18 facing the side opposite to the firstannular shield 11, and a second radiallyouter sleeve portion 19 extending axially, cantilevered from theflange portion 17 on the same side of thefirst sleeve portion 16, to which thesleeve portion 19 is radially facing and to which it is coaxial in relation to a common symmetry axis A of theshields rings - Always in combination with what has already been described, the
annular sealing element 15 comprises a firstannular lip 20 which extends axially cantilevered from theflange portion 13 of theshield 11 and towards theshield 10, rotating in use, also known by the term “flinger”, so as to be radially interposed between the first radiallyinner sleeve portion 16 and the second radiallyouter sleeve portion 19 of theshield 10, radially closer to the radiallyouter sleeve portion 19 than to the radiallyinner sleeve portion 16. - The
sealing element 15 also comprises a secondannular lip 21, elastically deformable, which is arranged radially on the inside of the firstannular lip 20 and which extends axially and radially (therefore is oriented inclined with respect to the axis A) to cooperate in contact and_with a certain interference, albeit reduced, with the firstrigid shield 10 and, in particular, according to the non limiting embodiment shown, with thesleeve portion 16, with which it defines a sliding seal which, in the embodiment shown, is a radial sliding seal. - In combination with this configuration, the
annular lip 20 is shaped so as to radially delimit on the outside a firstannular channel 22 facing afree end edge 23 of the radiallyouter sleeve portion 19 of the C-shaped shield 10; thefree edge 23 is opposite to theflange portion 17 of thefirst shield 10. - According to the non limiting embodiment shown in
FIGS. 1 and 2 , thefirst shield 10 carries integrally with theflange portion 17 thereof and on the side facing the second shield 11 a secondannular sealing element 24 made of elastomeric material and including a thirdannular lip 25, which extends axially cantilevered from theshield 10 and towards theshield 11 and which is radially interposed between thelip 20 and thelip 21. - The
annular lip 25 is shaped so as to radially delimit, on the outside, a second annular channel 26 (FIG. 2 ) facing afree end 27 of theannular lip 20. - In this way, the
shield 10 defines in radial section, together with theannular sealing element 24, an E-shaped element whose prongs or arms, defined by the two sleeve shapedportions annular lip 25 are arranged radially alternated with thelips - The
annular sealing element 15 also comprises, according to a further and important aspect of the invention, a furtherannular lip 28 which extends radially and axially cantilevered from thejournalling portion 12 of theshield 11 and towards theflange portion 17 of theshield 10, such as to be interposed between thejournalling portion 12 and the radially outer sleeve shapedportion 19 of theshield 10, next on the outside to the same in the radial direction and obliquely to theflange portion 17 of the firstrigid shield 10. - The
annular lip 28 is elastically deformable and is designed to assume selectively a first and a second configurations, different to one another; in the first configuration, non-deformed and shown inFIG. 2 , theannular lip 28 is in its normal operational condition, in whichlip 28 is not subjected to outer stresses and is not, therefore, elastically deformed; in such first configuration, in normal operational use,lip 28 does not contact a radially outer lateral surface 29 (FIG. 2 ) of the sleeve shapedportion 19, defining instead, therewith, a sufficiently small radial clearance to form afirst labyrinth seal 30, radially directed; in the second configuration, deformed and not illustrated for sake of simplicity,lip 28, in response to an external force applied to thesealing assembly 5, contacts the radially outerlateral surface 29 forming a contacting sliding seal thereon. - For this purpose, the
annular lip 28 extends cantilevered from an axially intermediate position of the journalingportion 12 of the secondrigid shield 11, such that, radially on the outside of theannular lip 28, a firstannular recess 32 is delimited betweenlip 28 and thejournaling portion 12, which first recess radially enlarges in axial direction towards theflange portion 17 of the firstrigid shield 10. - In the non limitative embodiment shown,
lip 28 extends cantilevered from an axially intermediate position of afirst portion 31 of theelastomeric sealing element 15 which radially covers on the inside at least part of thejournalling portion 12 of theshield 11 so that, radially on the outside of theannular lip 28, thefirst recess 32 is delimited betweenlip 28 and theportion 31 of theannular sealing element 15. - In the non limitative embodiment shown in
FIGS. 1 and 2 , between theportion 31 of theelastomeric sealing element 15 which, in the non-limiting example illustrated, completely covers radially on the inside the entirejournalling portion 12, and the sleeve shapedportion 19 is also present a sufficiently small radial clearance to define a secondradial labyrinth seal 33 developing axially. - The
labyrinth seal 33 extends axially by at least a stretch of the axial extension of thesleeve portion 19. - In the preferred embodiment illustrated, the
sleeve portion 19 comprises (FIG. 2 ), starting from theflange portion 17, a firstannular stretch 34, a secondannular stretch 35 and a thirdannular stretch 36. - The first
annular stretch 34 is straight and is arranged parallel to theannular lip 25, the secondannular stretch 35 is slanted so as to be distanced from the symmetry axis A on the side opposite to thefirst stretch 34, and the thirdannular stretch 36 is, proceeding in the axial direction, firstly radially bulged on the outside, then becomes thin in a radial direction towards thefree end edge 23 of the sleeve shapedportion 19. - In the illustrated example, the
labyrinth seal 33 extends axially by at least part of the axial extension of thethird stretch 36. - According to an aspect of the invention, the first and the second
annular channel first labyrinth seal 30 and also the eventualsupplementary labyrinth seal 33; furthermore, between theannular channel 22 formed bylip 20 and the sleeve portion 19 a firstannular chamber 37 for collecting said contaminants is delimited (FIG. 2 ), arranged downstream of thelabyrinth seal 33, and a secondannular chamber 38 for collecting the contaminants is delimited between thelip 20 and thelip 25. Therefore, thelabyrinth seal 33 is arranged upstream ofchambers - The
lip 28 is, according to an aspect of the invention, adapted to radially bend outwards (also thanks to the presence of the annular recess 32) to allow an easy and quick outflow of the contaminants by gravity from thecollecting chambers - Preferably, the
annular shield 10 is arranged axially on the inside of theannular shield 11, so that asecond end 39 of thejournalling portion 12, opposite to theend 14 and in this case completely covered by theportion 31 of theelastomeric sealing element 15, axially delimits a secondannular recess 40 on the outside of theshield 10, in front of it and on the opposite side to theflange portion 13. - According to another aspect of the invention, the
lip 20 and thelip 25 each have a respective free end, theend 27 already described for thelip 20 and anend 41 for thelip 25, which are radially bent outwards and towards thesleeve portion 19; a first radialannular space 42 and a second radialannular space 43 are delimited, between theend 27 and thesleeve portion 19 and between theend 41 and thelip 20 having substantially similar dimensions, respectively. - The first
annular sealing element 15 also comprises a fifthannular lip 44 which extends inwardly and radially cantilevered from a radiallyinner edge 45 of theflange portion 13 and which cooperates with the sleeve shapedportion 16 of theshield 10 to define athird labyrinth seal 46 therewith. - In this way, the contacting
sealing lip 21 is placed highly sheltered from external contaminants; in case of particularly abundant flows of contaminants, thelip 28 bends inward and closes, preventing the inflow of contaminants, then successively opens and allows the removal by gravity of said contaminants that might have previously entered and were collected in thechannels chambers - Moreover, the sealing
lip 21 and also theentire sealing assembly 5 are immune from any axial displacements between theshields - With reference now to
FIGS. 3 and 4 , they show asealing assembly 105 made according to the invention. Details similar to or identical to those as already described are indicated, for sake of simplicity, with the same reference numbers. -
Sealing assembly 105 is substantially identical tosealing assembly 5 already described except for not possessing thesealing element 24 withlip 25, and thelips sealing element 15 comprises, instead, in combination with what has been described, an elastically deformableannular lip 131, which replaceslip 21.Lip 131 is arranged radially inside theannular lip 20 and extends axially past thelip 20 to cooperate in contact with theflange portion 17 of therotary shield 10, with which it defines, according to this embodiment of the invention, an axial sliding seal. - The
annular lip 131, according to the preferred but not limitative embodiment illustrated, is shaped in radial section like an open V and comprises aroot portion 132 immediately adjacent to theflange portion 13 of theshield 11 and anend portion 133 arranged slanted with respect to the axis A so as to move away from the sleeve shapedportion 16 of theshield 10 as it approaches theflange portion 17 of theshield 10 itself. - The
lip 131 has at its end portion 133 afree end 134 which cooperates in contact with theflange portion 17; similarly thelip 20 has thefree end 27, which is radially bent outwards and towards thesleeve portion 19 so as to be slanted with respect to axis A, with an inclination substantially similar to that of theportion 133 of thelip 131. - The
free ends annular space 136 having dimensions substantially similar to the one of the radialannular space 42 delimited between thefree end 27 and the sleeve shapedportion 19 of theshield 10, thus allowing to optimize the spaces and facilitate in use the emptying of thecollecting chamber 37. - The described shape of the
portion 19 is a further barrier against the entry of contaminants into thechamber 37 and into the collecting channel 222 and, by defining towards the chamber 37 a sort of “flared” conduit i.e. enlarging towards thechamber 37, it favors emptying by gravity. - The
annular sealing element 15 preferably also comprises (FIG. 4 ) a furtherannular lip 138, which extends radially inwards from thelip 131, from a point comprised between theroot portion 132 and theend portion 133 of theannular lip 131, and which cooperates radially outwards with theflange portion 16 of theshield 10 to define therewith asecond labyrinth seal 139. - In case of strong external pressure or during the “cornering” of the vehicle provided with the hub bearing unit 1, the
lip 28 becomes sliding, thus although increasing friction only temporarily and slightly (thanks to reduced interferences that are created), but drastically increasing the sealing and protection action of thelip 131. - These advantages are finally also achieved thanks to the fact that the sliding seal performed by the
lip 131 is an axial seal and to the fact that thefree end 134 of thelip 131 is located radially on the outside of a secondannular collecting chamber 144 for the external contaminants which is bounded between thelips channel 22 pours from thefree end 27, which serves as a weir or drain, a possible excess of contaminants that are in thechamber 37 without the latter affecting thefree sealing end 134 of thelip 131. - With reference to
FIG. 5 ,reference number 205 indicates a further and preferred embodiment of the sealing assembly according to the invention. Details similar to or identical to those as already described are indicated, for sake of simplicity, with the same reference numbers. -
Sealing assembly 205 is similar to sealingassembly 5, from which it differs only for the shape of thesleeve portion 19, which is simplified and is simply cylindrical, and for the shape of the first elastically deformable annular lip, indicated with 220, which possesses an arc of a circle shape and defines the firstannular channel 22 with its own concavity, which faces towards thesecond sleeve portion 19 of the firstrigid shield 10; the firstannular lip 220 has a curvature such as to delimit, with thesecond sleeve portion 19 and with the first elastically deformableannular lip 28, a collectingchamber 237 for possible contaminants which pass beyond thefirst labyrinth seal 30. - The collecting
chamber 237 is shaped like a C facing towards the firstrigid shield 10 and has a depth taken in radial direction substantially equal to or greater than its own width taken in axial direction. - The first elastically deformable
annular lip 220 extends axially on the same side ofannular lip 28 and axially beyond the latter to form with theflange portion 17 of the firstrigid shield 10 either a sliding seal or a labyrinth seal. - Furthermore, the second
annular lip 21 is replaced by an elasticallydeformable lip 221, which cooperates in sliding manner with thefirst sleeve portion 16 of the firstrigid shield 10 by means of afree end 234 thereof, which end has in radial section a thickness D greater than the thickness d of aroot portion 235 of theannular lip 221 facing towards theflange portion 13 of the secondrigid shield 11. - This shape of
lip 221 allows a greater flexibility of the same to be obtained and at the same time allows a wider contact surface to be obtained betweenlip 221 and lateral surface of thesleeve portion 16, improving the sealing action. - All the objects of the invention are thus achieved.
Claims (12)
1. A sealing assembly for rolling bearings, in particular for a hub bearing unit of vehicles, adapted to be inserted between a first rotating ring, and a second stationary ring, to protect an annular space from external contaminants delimited between the first and second rings, having a first annular rigid shield designed to be supported by the first ring and a second annular rigid shield designed to be supported by the second ring; wherein:
i) the second annular rigid shield is L-shaped in radial section and provides a radially outer sleeve-shaped journaling portion and a flange portion that extends cantilevered radially inwards starting from a first end of the journaling portion facing towards the side opposite the first annular shield; the second annular rigid shield integrally and radially carrying on the inside a first annular sealing element made of elastomeric material; and wherein:
ii) the first annular rigid shield is shaped in radial section like a C having concavity facing towards the second annular rigid shield and includes a first radially inner sleeve portion defining a journaling portion of the first rigid shield, a flange portion that extends cantilevered radially outwards starting from a first end of the first sleeve portion facing towards the side opposite the second annular rigid shield, and a second sleeve portion which extends axially cantilevered from the flange portion of the first shield on the same side of the first sleeve portion of the first rigid shield; the first and second sleeve portion of the first rigid shield being radially facing to one another and being coaxial in relation to a common symmetry axis (A) of the first and second rigid shield;
iii) the first annular sealing element having a first, elastically deformable, annular lip that extends axially cantilevered from the flange portion of the second rigid shield and towards the first rigid shield to be radially interposed between the first and the second sleeve portion of the first rigid shield; and a second annular lip, elastically deformable, which is arranged radially on the inside of the first annular lip and extends axially and radially to cooperate in contact with the first rigid shield, with which it defines a sliding seal;
iv) the first annular lip is shaped to delimit radially outwardly a first annular channel facing towards a free end edge of the second sleeve portion of the first rigid shield, opposite the flange portion of the first rigid shield; wherein
v) the first annular sealing element provides a third annular lip, elastically deformable, which extends radially and axially cantilevered from the journaling portion of the second rigid shield and towards the flange portion of the first rigid shield, to be interposed between the journaling portion of the second rigid shield and the second sleeve portion of the first rigid shield, obliquely to the flange portion of the first rigid shield;
vi) the third annular lip designed to selectively assume: a first configuration, non-deformed, in which it does not contact a radially outer lateral surface of the second sleeve portion of the first rigid shield, defining therewith a sufficiently small radial clearance to form a first labyrinth seal, radially directed; and a second configuration, deformed, in which, in response to the application of a force external to the sealing assembly, it contacts the radially outer lateral surface of the second sleeve portion of the first rigid shield, forming a sliding seal thereon.
2. The sealing assembly according to claim 1 , wherein the third annular lip extends cantilevered from an axially intermediate position of the journaling portion of the second rigid shield, such that, radially on the outside of the third annular lip, a first annular recess is delimited between it and the journaling portion, which first recess radially enlarges in axial direction towards the flange portion of the first rigid shield.
3. The sealing assembly according to claim 2 , wherein the third annular lip extends cantilevered from a first portion of the first elastomeric sealing element that radially inwardly covers at least part of the journaling portion of the second rigid shield, the first annular recess delimited between the third annular lip and the first portion of the first annular sealing element.
4. The sealing assembly according to claim 3 , wherein between the first portion of the first elastomeric sealing element that radially inwardly covers at least part of the journaling portion of the second rigid shield and the second sleeve portion of the first rigid shield there is a sufficiently small radial clearance to define a second radial labyrinth seal with axial development; the second labyrinth seal extending axially by at least a stretch of the axial extension of the second sleeve portion of the first rigid shield.
5. The sealing assembly according to claim 4 , wherein the first rigid shield integrally carries on the flange portion thereof and on the side facing towards the second rigid shield a second annular sealing element made of elastomeric material and including a fourth annular lip, which extends axially cantilevered from the first rigid shield and towards the second rigid shield and which is radially interposed between the first and the second annular lip; the fourth annular lip shaped to delimit radially outwardly a second annular channel facing a free end of the first annular lip.
6. The sealing assembly according to claim 5 , wherein the third, elastically deformable annular lip is adapted to radially bend outwards to allow the outflow by gravity of possible contaminants that overcome the first labyrinth seal from at least one collecting chamber for the contaminants delimited between the first annular channel and the second sleeve portion of the first rigid shield.
7. The sealing assembly according to claim 6 , wherein the second sleeve portion of the first rigid shield further comprises, starting from the flange portion of the first rigid shield, a first, a second and a third annular stretch; the first annular stretch being straight, the second annular stretch being slanted to be distanced from the symmetry axis (A) on the side opposite the first stretch, and the third annular stretch being, proceeding in axial direction, firstly radially outwardly bulged, then becoming thin in radial direction towards a free end edge of the second sleeve portion; the first, second and third annular stretch defining towards the journaling portion of the second rigid shield a second labyrinth seal extending axially by at least part of the axial extension of the third stretch of the second sleeve portion of the first shield and which is arranged upstream of the at least one collecting chamber for the contaminants.
8. The sealing assembly according to claim 7 , wherein the first annular shield is arranged axially inwardly of the second annular shield, so that a second end of the journaling portion of the second rigid shield, opposite the first end of the journaling portion, axially delimits outwardly of the first rigid shield, in front of it and on the side opposite the flange portion of the second rigid shield, a second annular recess.
9. The sealing assembly according to claim 8 , wherein the second, elastically deformable annular lip extends axially past the first annular lip (20) to cooperate in contact with the flange portion of the first rigid shield, with which it defines an axial sliding seal; the second annular lip being shaped in radial section like an open V, and comprising a root portion immediately adjacent to the flange portion of the second rigid shield and an end portion arranged oblique with respect to the symmetry axis (A) to move away from the first sleeve portion of the first rigid shield as it approaches the flange portion of the first rigid shield.
10. The sealing assembly according to claim 1 , wherein the first elastically deformable annular lip possesses an arc of a circle shape and defines the first annular channel with its own concavity, which faces towards the second sleeve portion of the first rigid shield; the first annular lip having a curvature such as to delimit, with the second sleeve portion and with the first elastically deformable annular lip, a collecting chamber for possible contaminants which pass beyond the first labyrinth seal, which collecting chamber is shaped like a C facing towards the first rigid shield and has a depth taken in radial direction substantially equal to or greater than its own width taken in axial direction.
11. The sealing assembly according to claim 10 , wherein the first elastically deformable annular lip extends axially on the same side of the third annular lip and axially beyond the latter to form with the flange portion of the first rigid shield either a sliding seal or a labyrinth seal; the second, elastically deformable annular lip cooperating in sliding manner with the first sleeve portion of the first rigid shield by a free end thereof, which end has in radial section a thickness (D) greater than the thickness (11 of a root portion of the second annular lip facing towards the flange portion of the second rigid shield.
12. A hub bearing unit for vehicles, comprising an outer stationary ring, an inner rotating ring, rotating about a common relative rotation axis (A) of the inner and outer rings, a plurality of rolling bodies interposed between the inner and outer rings and accommodated in an annular space radially delimited between the inner and outer rings, and at least one sealing assembly arranged to close the annular space accommodating the rolling bodies, having a first annular rigid shield designed to be supported by the first ring and a second annular rigid shield designed to be supported by the second ring; wherein:
i) the second annular rigid shield is L-shaped in radial section and provides a radially outer sleeve-shaped journaling portion and a flange portion that extends cantilevered radially inwards starting from a first end of the journaling portion facing towards the side opposite the first annular shield; the second annular rigid shield integrally and radially carrying on the inside a first annular sealing element made of elastomeric material; and wherein:
ii) the first annular rigid shield is shaped in radial section like a C having concavity facing towards the second annular rigid shield and includes a first radially inner sleeve portion defining a journaling portion of the first rigid shield, a flange portion that extends cantilevered radially outwards starting from a first end of the first sleeve portion facing towards the side opposite the second annular rigid shield, and a second sleeve portion which extends axially cantilevered from the flange portion of the first shield on the same side of the first sleeve portion of the first rigid shield; the first and second sleeve portion of the first rigid shield being radially facing to one another and being coaxial in relation to a common symmetry axis (A) of the first and second rigid shield;
iii) the first annular sealing element having a first, elastically deformable, annular lip that extends axially cantilevered from the flange portion of the second rigid shield and towards the first rigid shield to be radially interposed between the first and the second sleeve portion of the first rigid shield; and a second annular lip, elastically deformable, which is arranged radially on the inside of the first annular lip and extends axially and radially to cooperate in contact with the first rigid shield, with which it defines a sliding seal;
iv) the first annular lip is shaped to delimit radially outwardly a first annular channel facing towards a free end edge of the second sleeve portion of the first rigid shield, opposite the flange portion of the first rigid shield; wherein
v) the first annular sealing element provides a third annular lip, elastically deformable, which extends radially and axially cantilevered from the journaling portion of the second rigid shield and towards the flange portion of the first rigid shield, to be interposed between the journaling portion of the second rigid shield and the second sleeve portion of the first rigid shield, obliquely to the flange portion of the first rigid shield;
vi) the third annular lip designed to selectively assume: a first configuration, non-deformed, in which it does not contact a radially outer lateral surface of the second sleeve portion of the first rigid shield, defining therewith a sufficiently small radial clearance to form a first labyrinth seal, radially directed; and a second configuration, deformed, in which, in response to the application of a force external to the sealing assembly, it contacts the radially outer lateral surface of the second sleeve portion of the first rigid shield, forming a sliding seal thereon.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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IT102015000006457 | 2015-02-17 | ||
IT10201506457 | 2015-02-17 | ||
ITUB20150128 | 2015-02-17 | ||
IT10201506543 | 2015-02-17 | ||
IT102015000006453 | 2015-02-17 | ||
ITUB20150360 | 2015-02-17 |
Publications (2)
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US20160236509A1 true US20160236509A1 (en) | 2016-08-18 |
US9956820B2 US9956820B2 (en) | 2018-05-01 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/045,611 Active 2036-03-10 US9956820B2 (en) | 2015-02-17 | 2016-02-17 | Sealing assembly for rolling bearings, in particular for a hub bearing unit of vehicles and associated hub bearing unit |
Country Status (4)
Country | Link |
---|---|
US (1) | US9956820B2 (en) |
CN (1) | CN105889331B (en) |
FR (1) | FR3032765A1 (en) |
IT (1) | ITUB20160770A1 (en) |
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US20160186811A1 (en) * | 2014-12-31 | 2016-06-30 | Lincoln Industrial Corporation | Bearing system with lubricated exclusion seal |
US20160186812A1 (en) * | 2014-12-31 | 2016-06-30 | Lincoln Industrial Corporation | Lubrication method for housing having an exclusion seal |
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Also Published As
Publication number | Publication date |
---|---|
ITUB20160770A1 (en) | 2017-08-16 |
US9956820B2 (en) | 2018-05-01 |
CN105889331B (en) | 2020-06-30 |
CN105889331A (en) | 2016-08-24 |
FR3032765A1 (en) | 2016-08-19 |
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